refactoring

utils/utils.go

@@ -1,9 +1,17 @@
 package utils
 
-import "math"
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"github.com/paulmach/orb/geojson"
+	"github.com/spf13/viper"
+	"math"
+	"net/http"
+	"strings"
+)
 
 func Haversine(lat1, lon1, lat2, lon2 float64) float64 {
-	// Radius of the Earth in kilometers
 	R := 6371.0
 
 	lat1 = lat1 * math.Pi / 180
@@ -20,3 +28,51 @@ func Haversine(lat1, lon1, lat2, lon2 float64) float64 {
 	distance := R * c
 	return distance
 }
+
+func CalculateDurationBetweenFeatures(feature1, feature2 *geojson.Feature) (int64, error) {
+	coords1 := feature1.Point()
+	coords2 := feature2.Point()
+	v := viper.New()
+	v.SetConfigName("config")
+	v.AddConfigPath(".")
+	v.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
+	v.AutomaticEnv()
+	_ = v.ReadInConfig()
+	routingBaseUrl := v.GetString("routing.valhalla.base_url")
+	url := fmt.Sprintf("%sroute?json=%s", routingBaseUrl, createJSONROUTERequest(coords1.X(), coords1.Y(), coords2.X(), coords2.Y()))
+	response, err := http.Get(url)
+	if err != nil {
+		return 0, errors.New("routing service error")
+	}
+	var result map[string]interface{}
+	decoder := json.NewDecoder(response.Body)
+	if err := decoder.Decode(&result); err != nil {
+		return 0, errors.New("routing response decoding error")
+	}
+	trip, ok := result["trip"].(map[string]interface{})
+	if !ok {
+		return 0, errors.New("routing response decoding error")
+	}
+	summary, ok := trip["summary"].(map[string]interface{})
+	if !ok {
+		return 0, errors.New("routing response decoding error")
+	}
+	duration, ok := summary["time"].(float64)
+	if !ok {
+		return 0, errors.New("routing response decoding error")
+	}
+
+	return int64(duration), nil
+}
+func createJSONROUTERequest(lat1, lon1, lat2, lon2 float64) string {
+	request := map[string]interface{}{
+		"locations": []map[string]float64{
+			{"lat": lat1, "lon": lon1},
+			{"lat": lat2, "lon": lon2},
+		},
+		"costing": "auto",
+	}
+
+	jsonRequest, _ := json.Marshal(request)
+	return string(jsonRequest)
+}